카오스 해석법을 이용한 전방십자인대 재건수술 환자와 정상인의 보행연구

고재훈(Jae Hun Ko),손권(Kwon Son),박정흥(Jung Hong Park),서정탁(Jeung Tak Suh) Korean Society for Precision Engineering 2006 한국정밀공학회지 Vol.23 No.2

Anterior cruciate ligament(ACL) injury of the knee is common and a serious ACL injury leads to ligament reconstruction surgery. Gait analysis is used to identify the result of surgery. The purpose of this study is to numerically evaluate and classify knee condition of patients through the chaos analysis. Experiments were carried out for 13 subjects(8 healthy subjects, 5 ACL deficient patients) walking on a treadmill. Sagittal kinematic data of the right lower extremity were collected by using a 3D motion analysis system. The recorded gait patterns were digitized and then coordinated by KWON3D. The largest Lyapunov exponent from the measured knee angular displacement time series was calculated to quantify local stability. It was found that the Lyapunov exponent becomes larger as the knee condition becomes worse. This study suggested a method of the severity of injury and the level of recovery. The proposed method discerns difference between healthy subjects and patients.

광촉매를 이용한 셀룰로오스섬유의 기능화에 관한 연구 : 항균·소취성 및 자외선 차폐성을 중심으로 Focusing on Antibacterial activity, Deodorization & UV cut ability

권오경,문제기,손부헌,최영희 한국의류산업학회 2003 한국의류산업학회지 Vol.5 No.4

In this study, we measured the antibacterial activities, deodorization, UV cut ability, whiteness and SEM, according to the size(5 μm, 15 ?m) of ThiO₂, concentration(3%, 5%, 10%) and dipping temperature(50℃, 70℃) with using anatase type of TiO₂ photocatalyst. Photocatalyst is the substance which carries out functions, such as decomposition, removal, deodorization, antibacterial, etc. of a contaminant, in a place with light based on an oxidation-reduction reaction. The results of this study were as follow. Antibacterial activities are increased with increasing of the TiO₂'s concentration, and TiO₂ has high antibacterial activities for Staphylococcus aureus but it has low antibacterial activities for Klebsiella pneumoniae. The deodorization and UV cut ability is very good, therefore be able to get good effects with usingonly 3% of TiO₂. Every effects are increased by using small size of TiO₂ and high dipping temperature.

이동 단말기용 내장형 slot 안테나 구현

권원현,허재헌 안양대학교 산업기술연구소 2002 自然科學硏究 Vol.9 No.-

본 논문에서는 이동통신 단말기용 내장형 안테나를 연구 개발하였다. 개발된 안테나는 동축형 구조를 갖고 있으며, 스트립 선로를 이용하여 급전 구조를 구현하였다. 안테나의 공진부는 슬롯 구조를 갖는 동축 슬롯 공진형으로 설계하여 IMT-2000 대역인 2.0 GHz 대역에서 공진이 가능하도록 하였다. 구현된 안테나는 26 x 13 x 1.2 ㎣의 크기를 지녀 이동통신 단말기에 쉽게 내장할 수 있음을 알 수 있었다. In this paper, embedded antenna for wireless mobile phone is developed. Developed antenna uses the coaxial type slot structure and its feeding line is implemented by using microstrip line. Resonator part of slot antenna is designed utilizing coaxial type slot resonator structure, and its design parameters are optimized to have 2.0 GHz resonance frequency for IMT-2000 handset. Implemented antenna has 26 x 13 x 1.2 ㎣ physical dimensions, which can be easily applicable to an embedded antenna of mobile phone.

Paste법에 의한 0.1V강의 침붕처리에 관한 연구

권동일,김강형,김진관,이성훈,윤재홍 國立 昌原大學校 産業技術硏究所 1994 産技硏論文集 Vol.8 No.-

0.1V강의 표면경도를 향상시키기 위해서 Boronizing처리를 실시하여 Hv=1500∼2000의 높은 경도값을 나타내는 붕화물층을 얻었다. 붕화물층의 두께와 처리시간과의 사이에는 방물선관계를 나타내었으며 붕화물층 생성 겉보기 활성화에너지는 94kJ/mol이다. 또한 900˚C, 3시간 침붕처리했을 때가 가장 높은 경도분포값을 나타내었으며 그 이상 장시간 처리하면 오히려 경도가 감소하는 경향을 나타낸다. 그리고 침붕층은 20% HCl, 20% H₂SO₄용액에서는 뛰어난 내식성을 가지나, 20% HNO₃용액에 대해서는 상대적으로 내식성이 떨어졌다. 그리고 내고온산화성은 대기중 800˚C까지는 침붕처리한 시편이 우수했으나 900˚C부터는 오히려 감소했다. To improve the surface hardness of the 0.1V steel, by Boronizing Treatment, We got boride layer showing high hardness, Hv=1500∼2000. A parabola relationship was appeared between boride layer thickness and treatment time, and apparent activation energy to form the boride layer 94kJ/mol. Moreover, We obtained the most high hardness distribution value when had the boronizing treatment for 3 hours at 900˚C. On the contrary, If we did boronizing treatment above 3 hours, the hardness appeared decreasing tendency. The boride layer had a good corrosion resistance at a solution of 20% HCl and 20% H₂SO₄, but correlatively the corrosion resistance of the boride layer was declined at a solution of 20% HNO₃. And the boronized specimen had a good high temperature oxidation resistance until 800˚C in the atmosphere but the high temperature oxidation resistance go down above 900˚C.

개인휴대 단말용 무선부 회로 설계 개발

권원현,허지헌,홍진표 안양대학교 자연과학연구소 1996 自然科學硏究 Vol.3 No.-

본 논문에서는 미래의 개인휴대통신 서비스용 단말인 1세대 PDA (Personal Digital Assistant)의 설계, 개발 및 시험에 관하여 서술하였다. 135 x 76 x 18 ㎜ 크기의 개발된 제품은 기존의 전자수첩에 pager의 기능을 부가시킨 Pager PDA로서 320 MHz 대역의 1200bps/2400bps 정보를 모두 수신 가능하며, 전국적인 서비스가 가능한 광역 페이져의 형태로 설계하였다. 이를 위해 사용지역에 따라 주파수가 자동으로 변환되는 PLL 형태의 국부 발진기를 설계 개발하였다. 시험결과 개발된 제품은 일반 페이져가 만족하여야 할 IEC 표준 규정을 모두 만족하였으며, 수신감도 또한 우수함을 알 수 있었다. In this paper, first generation of PDA(personal digital assistant) in which the function of pager is merged into electronic notebook has been developed and commercialized to fulfill the requirement of PCS equipment. Developed product of 135 x 76 x 18 ㎣ size operates in 320 MHz paging frequency bands and receives 1200bps or 2400bps paging data. And also, it adopts PLL type local oscillator whose operating frequency changes with the user locations to ensure the nationwide paging services. Experimental results show that the developed product meets well all of the IEC specifications and has high receiving sensitivity.

소양호의 어류군집 동태

최재석,이광열,장영수,고명훈,권오길,김범철 한국어류학회 2003 韓國魚類學會誌 Vol.15 No.2

2001년 4월부터 2002년 9월까지 소양호의 어류군집 동태를 조사한 결과는 다음과 같다. 조사된 어류는 총 11과 38종이었다. 한국 고유종은 P. tenuicorpus, C. splendidus, S. gracilis majimae, S. japonicus coreanus, H. mylodon, G. brevibarba, M. yaluensis, M. longidorsalis, C. koreensis, C. rotundieaudata, S. microdorsalis, P. koreanus, L. andersoni, C. herzi, O. patycephala 등 15종(40.54%)이었다. 우점종은 Z. platypus(39.60%), H. olidus(39.47%), S. gracilis majimae(12.24%), S. japonics coreanus(2.11%), P. fulvidraco(1.48%), L. macrochirus(1.40%) 등이었다. 채집된 어종들의 생체량을 보면 Z. platypus가 19.48㎏, H. olidus로 8.75㎏, C.cuvieri 7.42㎏, L. maeroehirus 7.39㎏, H. labeo 6.85㎏의 순으로 나타났다. 소양호에서 확인된 도입종은 A. japonica, H. eigenmanni, H. olidus, P. altivelis, C. urotaenius, R. giurinus, T. brevispinis, C. carpio(Israeli type), c. euvieri, Onchorhynchus mykiss, L. macrochirus, M. salmoides, I. puntatus 등 13종이었다. 이 중 C. carpio(Israeli type), C. cuvieri, Onchorhynchus mykiss, L macrochirus, M. salmoides, I. puntatus는 국외종이며, A. japonica, H. eigenmanni, H. olidus, P. altivelis, C. urotaenius, R. giurinus, T. brevispinis 등은 국내 다른 하천ㅇ로부터 유입된 종이다. The dynamics of the fish community in Lake Soyang, Korea, was investigated from April 2001 to September 2002. During the surveyed period 38 species belonging 11 families were collected. There were 15 Korean endemic species 39.47%, including Pseudopungtungia tenuicorpus, Coreoleuciscus splendidus, Squalidus gracilis majimae, S. japonicus coreanus, Hemibarbus mylodon, Gobiobotia brevibarba, Microphysogobio yaluensis, Microphysogobio longidorsalis, Iksookimia koreensis, Iksookimia rotundicaudata, Silurus microdorsalis, Pseudobagrus koreanus, Liobagrus andersoni, Coreoperca herzi, and Odontobutis platycephala. Dominant species were Zacco platypus (39.60%), Hypomesus olidus (31.70%), Squalidus gracilis majimae (12.24%), Squalidus japonicus coreanus (2.11%), Pseudobagrus fulvidraco (1.48%) and Lepomis macrochirus (1.40%). The biomass of collected fishes were Zacco platypus (19.48 ㎏), Hypomes olidus (8.75 ㎏), Carassilus cuvieri (7.42 ㎏), Lepomis macrochirus (7.39 ㎏) and Hemibarbus labeo (6.85 ㎏). Of the 13 introduced fishes in Lake Soyang Cyprinus carpio (israeli type), Carassius cuvieri, Onchorhynchus mykiss, Lepomis macrochirus, Micropterus salmoides and Ictalurus puntatus were originated from foreign countries but Anguilla japonica, Hemiculter eigenmanni, Hypomesus olidus, Plecoglossus altivelis, Chaenogobius urotaenius, Rhinogobius giurinus. Thridentiger brevispinis were introduced from other native river systems.

마우스의 BCG감염이 R.tsutsugamushi의 증식에 미치는 영향

김인재,전창덕,홍영권,정현택,이복수,장우현,김익상,박석돈 대한감염학회 1993 감염 Vol.25 No.2

It has recently been reported that gamma-inteferon(INF-r) and tumor necrosis factor(TNF) or lipopplysaccharide(LPS) activate macrophages to kill intracellular parasites by means of nitrc oxide (NO). It is now generally accepted that NO is the endothelium-derived relaxing factor, and that it also paticipates in the regulation of the nervous and immune systems. Activated macrophages form NO?? and NO?? from the terminal guanidino nitrogen atoms of L-arginine by the process now known to proceed via the formation of NO. This pathway is inhibited by the L-arginine analog(N?? monomethyl-L-arginine; N??MMA), forms L-citrulline as a co-product and is responsible for the cytotoxic action of macrophages. In this study, the authors found that INF-r and/or LPS induced murine macrophages to kill Rickettsiae tsutsugamushi in vitro and macrophages from BCG-infected mice got the host resistance against R.tsutsugamushi in vitro as well as in vivo. The rickettsicidal effect induced by the combination of INF-r and/or LPS induced mice got the host resistance against R.tsutsugamushi in vitro as well as in vivo. The rickettsicidal effect induced by the combination of INF-r and/or LPS can also be completely inhibited by N??MMA, leading to a dose-dependent inhibition of NO production. These datademonstrate that INF-r and/or LPS as well as BCG-activated macrophages mediate host resistance aganist R.tsutsugamushi infection through NO, which is necessary for the intracellular parasite.

학생청소년의 불안성향과 문제행동 유형간의 상관분석

김헌수,이재우,나철,김영돈,김민호,김은희,권지란,박광식,이길홍,민병근 중앙대학교 의과대학 의과학연구소 1987 中央醫大誌 Vol.12 No.4

The purpose of the present study was to examine the relationship between their problem behavioral pattern and anxious trends among Korean student adolescent. Zung's measurement of anxiety level undergone through used of the self-rating anxiety scale. the data were collected through the questionaire survey which was conducted on Dec.1, 1983. Subjects served for this atudy consisted of 1,404 syudents in Korea, randomly sampled from Korean student population by means of census method. The data were analysed by CDC-174 computer of KAIST, using SPSS pogram. Statistical methods empoyed were χ^2 test and Eta measures. the results of this study were as follows. 1. It showed that students psychological anxious trends had greatest significant correlation with adolescent student's problem brhavioral pattern, but the cardiovascular, respiratory, gastrointestional and genitourinary anxious trends has not significantly related with student's problem behavioral pattern. 2. Students group with undersocialized aggressive, undersocialized nonaggressive,undersocialized school-norm avoidant, or socialized nonaggressive behavioral patterns were less anxious, whereas those with socialized latent aggressive, socialized sexual, or socialized modellong behavioral patterns were higher anxious.

서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)

김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2

Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.

생물검정법을 이용한 하수슬러지 장기연용 토양의 독성평가

남재작,이승환,권순익,홍석영,임동규,고문환,송범헌 한국환경농학회 2004 한국환경농학회지 Vol.23 No.4

생물검정법에 의한 토양 내 독성평가의 유용성을 확인하기 위해 두 종류의 하수슬러지를 7년간 연용한 토양을 Microtox^(?) 생물검정법과 상추종자 뿌리 신장법을 사용하여 독성을 평가하였다. 이 방법들은 하수오니의 종류나 시용량에 따른 토양의 독성 정도를 잘 평가 할 수 있었다. 상추종자 뿌리 신장법은 특별한 장비나 복잡한 처리 없이도 유의성 있는 결과를 구할 수 있었고 Microtox^(?) 검정법은 전반적으로 재현성과 감도에서 유의성이 있었으며 또한 유기화합물에 대한 종합적인 평가도 가능하였다. 하수오니와 같이 다양한 화합물이 혼재되어 있는 유기성 자원의 토양 시용시 기존의 제한된 화학성분의 토양 분석법만으로는 독성평가에 한계가 있고 또 개별적으로는 별 영향이 없더라도 여러 화합물이 복합적으로 존재할 때 나타나는 독성작용에 대한 평가는 더욱이 어렵다. 그러므로 이러한 영향을 종합적으로 평가할 수 있는 생물검정법이 토양의 독성 평가에서 화학분석법을 보완하는 평가방법으로서의 중요성은 충분하다고 할 수 있다. 그리고 생물독성법의 유용성을 높이기 위해서는 생물검정법의 시료 추출방법 개선과 실험의 재현성을 높이기 위한 노력이 필요하리라 생각된다. 따라서 이런 생물검정법의 많은 제약에도 불구하고 환경의 종합적인 평가에 있어서 생물검정법의 중요성은 대단히 크며 직접적으로 생물을 이용하는 방법뿐만 아니라 유전독성 평가 방법 등 다양한 방법들이 환경독성 평가에 응용될 수 있을 것으로 판단된다. Bioassay was employed to assess toxicity of soil which had been treated with sewage sludges for seven years. The Microtox^(?) and root elongation test of lettuce (Lactuca Saliva) elucidated that the intensity of soil toxicity was closely related with the types and amount of sewage sludges applied. Both bioassay methods proved to be useful in an assessment of soil toxicity and were consistent to some extent with the conventional chemical analysis methods. EC_(50) values resulted from Microtox^(?) were highly correlated with concentration of heavy metals in soils amended with sewage sludges : Cu (r²= 0.86^(**)), Cr (r²= 0.84^(**)), Ni (r²= 0.83^(**)), and Zn (r²= 0.69^(**)). This demonstrated that both bioassay techniques could be employed as tools for soil toxicity assessment when the soil was exposed to solid wastes such as sewage sludge.